I am just brand new to woodworking. In the process of collecting tools along the way. I am looking to purchase the Festool RO 90 DX 3 1/2” disc sander. Because of its size I am looking at some thing a little bigger to go with it. And I was thinking of the ETS 125 EQ random orbit sander with a 5” sanding pad diameter. My plan is to purchase RO 90 DX. Is the 5” ETS unit good enough or should I go with a 6”. My plan is to start small jobs and I hope to build my own furniture. Will the 5” augment the 3 1/2 or do any of you guys who own the RO 90 can recommend another Festool unit. I am thinking I should have two. Your thoughts Ladies and Gentlemen.Dan

I have the 150/3. I only use 6” sanders. I will be getting a 150/5 soon. I would not bother with the a small sander.I do furniture for a living. I have tried 5”, but 6” is just faster and better for me. Your mileage may vary. bob

I don’t beleive I would buy the RO 90 first. It is a great sander, but in my opinion rather limited because of it’s small size. I have the RO 125 and the RO 150 and for the work I do I much prefer the 125.

I also have the ETS 125 and love it.

The prefered sizes are personal and are determined buy the type work you do.